. >> reporter: don offered a different explanation when we told him about our video visiting a bar in uniform during his shift. >> i do security check there. what happens, can we talk off camera for a second? >> reporter: he said he couldn't elaborate because of an investigation. young insist there's nothing illegal happening inside of cafe juliet. i had a regular tell me flat out you can get girls here. >> that's completely untrue. i can't say for a fact because i don't follow the people home. >> reporter: can you tell us what kind of business is being run here? we found the bar's manager john out front. what about all the girls we see come in here every night? >> you see any girl come in here now? >> any police officer should know as you and i should know what's going on in there. >> reporter: we showed our video to former alameda county charles plumper. >> i would start immediate investigation, absolutely. right now. >> reporter: plumber with more than 50 years in law enforcement doesn't believe we stumbled into an ongoing investigation. >> if they were checking on this place, it w